"SEITECH dollies are the easy-to-use, light-weight, small boat transportation solution. The Sunfish dolly has been designed specifically to fit and support the shape of the hull. SEITECH dollies allow you to spend less time getting your boat to and from the water and more time on the water." (Laser Performance).
That's the good news. The bad news is they are hard to find. I managed to round up one on craigslist for a Sunfish and another that was originally for a john boat. I bought a tow strap and made that into a sling and it works great.